package login;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;

@WebServlet("/index")
public class IndexServlet extends HttpServlet {

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
//        如果有已经保存的会话就返回旧的会话,如果没有不创建新的会话
        HttpSession session = req.getSession(false);
//        判断是否为登录状态
        if (session == null) {
//            如果未登录则重定向到登录界面
            System.out.println("用户未登录");
            resp.sendRedirect("login");
            return;
        }
        String username =  (String) session.getAttribute("username");
        resp.setContentType("text/html;charset=utf8");
        resp.getWriter().write("欢迎"+username+"回来!");
    }
}
